Piston



H. KISTNER.

PISTON.

APPHCATION HLEDJUNE7.I921.

Patented July 25, 1922.

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the following is a specification.

This invention relates in general to engine pistons of the type described in my co-pending application filed June 1, 1920, Serial No. 385,699 and comprising a piston body having a sleeve slidable thereon and influenced by' spring pressure to maintain a yielding la-teral compression on the piston rings to automatically and uniformly expand the rings into engagement with the cylinder walls.

The obj ectsof the present invention are to provide a piston of the character described embodyin novel features of construction whereby he parts of the piston can be easily and quickly assembled; to provide such a piston having improved means for mounting the springs wherebythe springs can be easily and quickly placed in or removed from .position in the piston in assembling or replacing the same; to provide a piston of this character having an improvedconstruction for maintainin the springs in position and preventing buc ling thereof; to thus provide a spring carrier adapted to be detachably secui ed to the piston body for positioning the springs between the said "body and the sleeve; and to obtain other results and advantages as" may be brought out by the following description.

Referring to the accompanying drawings, in which like numerals of reference indicate the same parts throughout the. several views, Figure 1 is a vertical longitudinal sec-. tional view through a piston constructed in accordance with my invention;

Figure '2 is a horizontal sectional view taken on the line 2-2 of Figure 1 Figure 3 is 'a fragmentary longitudinal,

sectional view taken on the line 3- -3.of Figure 2 ,and

Figure 4 is a detached plan view-of one of the spring carriers.

In the embodiment of my invention shown on the drawings, the reference character A designates the body of the piston which, is

preferably formed of aluminum and is proadded at one end thereof with a solid head 1 and an annular flange 2 having its underside inclined as at 3. The piston body is formed Specification of Letters Patent. Patenteqlgfuly 25 1922 Application filed. June 7, 1921.

Serial No. 475,664.

on opposite sides of the interior thereof with bearings 18. to receive the wrist pin 19. The open end of the piston or the end thereof opposite the head 1 is formed with a plurality of longitudinal equidistantly spaced slots 4 which open through the end of the piston, and the said end of the piston is formed between the said slots 4 with inwardly projecting radial lugs 5. In the present instance I have shown four slots 4 and four lugs 5, but

"it will be understood that the number of these parts may be varied as desired.

A sleeve or jacket 6 is slidably mounted on the body A of the piston exteriorly thereof and has its inner end inclined as at 7 to engage the correspondingly inclined sides of one of the piston rings 8 which are interposed between the sleeve 6 and the flange 2 of the piston. The rings 8 are separated by a spacer 9, and the ring 8 in engagement with the flange 2 is inclined correspondingly to said flange, as clearly shown in Figure l of the drawings.

The sleeve 6 is normally yieldingly influenced into engagement with the piston rings 8 by means of springs 10 interposed between spring carriers 11 and lugs 12 preferably 1 formed integral with the sleeve and projecting radially inwardly through the slots 4 in the body A. The spring carriers 11 are preferably arcuate in shape and of a radius substantially equal to the radius of the interior of the piston body A, the said carriers havingenlarged ends in which are formed recesses 13 to receive two of the springs 10, as shown in Figures 1 and 4. The spring carriers 11 are positioned upon opposite lugs 5 of the piston body A and may be secured thereto by means of cotter pins or like fastening' members 14 which project through lugs 15 on the carriers and the correspond.-

ing lugs 5 of the piston. The spring carriers I 11 are of suflicient length to span the spaces between'the lugs 5 inthe body A and rest upon the ends of the lugs 5 adjacent those to which the carriers are secured by the pins 14.

In assembling the piston the rings 8 and spacer 9 are first slipped over the open end of the body, after which the sleeve 6 is telescoped upon the body A with the lugs 12 thereof entering the slots 4. The springs 10 are then positioned in the recesses 13 to the spring carriers, whereupon the springs 10 are compressed and the carriers placed upon the corresponding lug 5 of the piston body. The compression of the springs thus yieldingly forces the sleeve 6' against the rings 8 to produce an automatic and adapted to be detachab uniform expansion of the rings into ongagement with the cylinder walls. The spring carriers 11 enable the springs to be easily and quickly placed in or removed from position in the piston body A, and also serve to house the springs and prevent bucklingthereof or injury thereto. I have shown two spring carriers each of which is adapted to carry two springs, but it will be understood that the number of carriers can be varied as desired. Under some conditions the oil in the cylinder may tend to pass between the sleeve 6 and the piston body A and past the rings 8 into the combustion chamber, and to avoid this possibility I preferably form the piston body A.

with a circumferential groove 16 in which is placed suitable packing 17, such for instance as asbestos.

l/Vhile 1 haveshown and described one possible embodiment of my invention, it will be understood that this is for the purpose of illustrating the principles thereof only, and that many modifications and changes can be made in the detail construction of the invention without departing from the spirit or scope thereof. Therefore, I do not desire to be understood as limiting myself except as required by the following claims when construed in the light of the prior art.

Having thus described the invention, what I claim is:

1. A'piston including a body having a plurality of lugs thereon, a sleeve slidable on said body exteriorl thereof, members 'iyconnected to said lugs, and means carried by said members for securing said sleeve on said body.

2. A. piston includinga body having a plurality of lugs thereon, a sleeve slidable on said body exteriorly thereon-spring carriers adapted to be detachably connected to said lugs, and springs mounted in said carriers and interposed between said body and said sleeve.

3. A piston including a bod having a plurality of inwardly projecting radial lugs thereon, arcuate members having a radius substantially equal to the radius of the interior of said body mounted on said lugs, and means carried by said members for securing said sleeve on said body.

a. A. piston including a body having a plurality of longitudinal slots therein and lugs between said slots, a sleeve slidable on .said body exteriorly thereof and provided slots, a sleeve slidable on said body exteriorly" thereof-andprovided with lugs arranged in said slots, arcuate members having a radius substantially equaI to the radius of the interior of said body mounted on said lugs of thebody and extending across said slot, and means carried by said members and engaging said lugs on the sleeve to secure said sleeve on said body.

6. A piston including a body having a plurality of longitudinal slots therein and lugs between said slots, a sleeve slidable on said body exteriorly thereof and provided with lugs entering said slots, members mounted on certain of said lugs on the body and extending across the adjacent ones of saidslots, and means mounted in said members and engaging said lugs on the sleeve to connect said sleeve and said body.

7. A- piston including a body having a plurality of longitudinal slots therein and lugs between said slots, a sleeve slidable on said body exteriorly thereof, andprovided with lugs entering said: slots, spring can riers mounted on certain of said lugs on the body and extending across the adjacent ones of said slots, and springs mounted in said spring carriers and engaging at one end the corresponding lugs on said sleeve.

8. piston including a body having a plurality bf longitudinal slots therein and lugs between said slots, a sleeve slidable. on said body exteriorly thereof and provided with lugs entering said slots, arcuate spring carriers having a radius substantially equal to the radius of the interior of said body adapted to be mounted on certain of said lugs on the body and extend across the adjacent ones of said slots, said carriers being formed with spring-receiving recesses to register with the lugs on said sleeve in said slots, and springs arranged-in said recesses,

and engaging said lugs on the sleeve to secure said sleeve on said body.

' HERMAN KISTNER. 

